40 cal to 357 sig

[iomskp]

I have a Springfield xd in 357 sig, none of the local shops sell 357 sig brass but I have a bag of 40 cal brass is it possible to neck them down to 357, if so how would you go about it,

[jhunt1981]

Can't be done. The sig is longer than the .40. You'd have to stretch the brass something like. 015" IIRC.

[iomskp]

Thank you, it sounded to easy.

[SOFMatchstaff]

It is Easy, size it down and set the headspace with the shoulder and do a chamber check to be sure its correct. I load a cannelured bullet and crimp, I dont expand the neck at all, just a slight bell to facilitate bullet seating. that leaves a bit more neck tension. Tinker with it a bit and you can make it work fine.. I use the 40 brass for the field load that I wont get back when it hits the ground. It Will work...

[McFred]

SOFM's right, it's easy: lube the cases, single pass into a 357Sig FL sizer and you're done.

You do have an already short case neck a little shorter, but you can work around that.

[Stephen Cohen]

There were many in this Country running it into a 357 sig die and calling it done, yes the neck will be a little short but does not seem to effect performance. Regards Stephen

[MrWolf]

Starline brass sells 357 sig for like $0.19 each and in stock.

[iomskp]

Thanks folks I will give it a try.

[iomskp]

Hello Mr Wolf Sadly in my part of the world the cheapest 357 Sig brass ( Starline ) is $50.00 per 100 plus $15.00 - $20.00 post.

[MrWolf]

Ouch. Sorry didn't notice you were down under. Another thread had a guy trying to make them from 40's and I was questioning why when I just bought some from Starline. Good luck, I love the 357 sig.

[wolfwing]

Yes, easily formed. I ran 357 Sig brass, 40 S&W brass, jacketed bullets, cast bullets, fast powder, slow powder ... All in one magazine, trying to get my 320 Sig to malfunction. No problems at all. I would say 50% of the ammo I run thru my 357 Sig is formed from 40 S&W brass.

[fcvan]

I picked up so much range pick up in 357 SIG, I bought a drop in barrel for my Glock 22. I told a buddy I was collecting more and he said he would give me his. Then he gave me 600 rounds of factory. Fun round to load and shoot. I hope the OP will find some brass

[gnappi]

I've been doing it since the .357 sig came out, the neck winds up a tad shorter, but I've shot thousands of them with only one bullet setback which I corrected with a crimp that was a tad heavier.

Are they IDEAL? Maybe / maybe not but they sure beat no shooting.

PS, on oncefirebrass dot com I found and bought several thousand .257 sig brass at $40 per thou a few weeks ago.